I hope I can help-the swaybar on a TE is T-specific, so I seriously doubt that the 500E piece would fit. As to the rear struts, the 500Es are valved quite a bit differently, and have several components not found on other W124s (like extension-limiting springs & secondary elastomers that stiffen things up when the strut's compressed)-they'd probably work, but given their considerable price (around $400 per) I'd want to hear someone else's success story before I jumped in and bought a set.
Have you contacted AMG? AMG's done Wagon conversions, so perhaps they'd know what could/would work.
"If everything seems under control, you're simply not going fast enough" --Mario Andretti
1995 E500 street car
1986 Porsche 944 Turbo S track car